Changed type restrictions in Converters
Changed type restrictions in Converters

Should address Issue #12

Vython/FsXaml,ovatsus/FsXaml,ovatsus/FsXaml,cloudRoutine/FsXaml,Vython/FsXaml,cloudRoutine/FsXaml,fsprojects/FsXaml,mkb137/FsXaml,mkb137/FsXaml